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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fda166475feab3b5913485639fe7a1341d9fe36412493025e69c4bd7330c5fa7' 
  AND token = 'WyEjKgP9ZAOvk/ekiEWasUtNpI/Je1oZz1d7IaRo08s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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