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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '40b2b2028a4e7acbd381a2069d2a52f9f47e311def15722f14446f3143b7f23b' 
  AND token = 'KsTEXjXIM1Gvhlge+UnpYT1avRc8lnGnaDKDFWWb1MU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}