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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4e9866af99c0b19c4f4f10c44e7e92c4c94991435a3fe7702d4aeaeab001a466' 
  AND token = '1GCv2UB6M6Q9ZIlvW9WtL7MXlkoF+CUhG95DabPeU0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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