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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6b5cff66430dd8f176355fd554f4d577ee1009d05e688b410e6825f616d7757f' 
  AND token = '4tJDtKg3izPD8vUvnR9Hd8SVmteimhTDmNGnnfSYRS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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