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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5e172585f07d06c59895202430dafc48e62001dd3d6508f8f20b7eed0e39e221' 
  AND token = 'kJ0zV0Eme6XeIZjsEKc3zO8dCrDBJ/NaZptCbCZnkf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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