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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '11c8e3398bca85e8e38de82ef8c882dfc1aabc29039005dc2024e71e52fe2997' 
  AND token = 'rNuM/0qDZpKk8muaLbAUWJwTMjZtN8yks57SnRZWz4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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