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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '08673e700a476702a52cb86301f14a1cbe1b0e8c0f1710cd3409bf694311ef8c' 
  AND token = 'rra6yYuI63iR6Tsw5bu+3n+iGZ90fNlZ2RoFqu/baGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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