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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e9fdff066ff682ea899746c89c4da8d7f926f658d92ed3ab407697e43a038157' 
  AND token = 'BCj7UxJim6fkaNUxDT859ljDFIxcuNe2x9tistrMXa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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