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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f11a49f55fa5b3c660c3bcde6e2e53d07ec7d879fed96219118f1bf21b0e259d' 
  AND token = 'Knuawdd8zzVR8qeA1OCI5usE7YECj0Z/2dgRZiGMXbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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