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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c629a5e0b888da37b2c4045f3825da2c78a4bab85b108d6cda8ae5433d5779e3' 
  AND token = 'ZEvpY74LcXWbZvim+x6xnP4BM3Og600bxEdPLvX9OSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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