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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '62c291611d1bcada2e0fae09b624912bb85b53988188e62364c0ea14ca2251f9' 
  AND token = 'sbjtJA/My3Aq2cKLUjU8G40QtlFc6TVm+eHQDLpvxJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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