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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '513a5f4fd32771e7d4e7be2e2a8a62b2dea679439050a99a5a401808516d7b10' 
  AND token = 'tX1gdhsIhI00e7kiUpwzbDkbHJ669wqaS9TrdA+mChg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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