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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c05a4c6367a6bde91ffd36a40c670400b94722779ef200e715fbe9b4f7fca09e' 
  AND token = 'zCj/dIlAD82Rvi7xwSbQJGF/a6QtKvSN7etY4ddmx3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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