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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3c5571bdb689cbd8637b2d0e4630a8716c8b96445361893ce723022244438cb0' 
  AND token = 'OPumU7b857LOZwlFT5YPt63vOdyhDPNcymeY+q9VP6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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