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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cd0556cb63c544e50f5e163ea3f9eb14da8018d24a87a468d009654351f03a11' 
  AND token = 'jiCSuM4lgYYrZWvf5rOdbTYpwzyKuEo04KGcZzcCyxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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