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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a07558b918f0d6bf0db82bb22820868c2f86c39dc1ce051b593795d1e675cc9b' 
  AND token = 'eEdOeTKFCOOPM9xD5/Oxx08PTJGj748hUeMk1EiLCGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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