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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '93e460083664931188f90ff906767c10483b5afe7fa1519ea4ccf89369e0e506' 
  AND token = 'oTQi115HC5aS3F9+14a+Qko4q5g8yaPSCDjhhV99WHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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