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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6cc917f148fb8bbb5d3006e81b696cc1b6e2b8ba636a98256547bccacc802ebb' 
  AND token = 'O9SXQQM2fvM82eHWnv5oT2SlTSu2ANUpUlNB+3GDCQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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