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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '74035aa710d664e0684747d37600271ce0f41d207c086b706fe00e5ae0772a15' 
  AND token = 'R5UsdPSmNL8d4exu/Lot6Y6SzqsKc8z44yAaW+ZKl4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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