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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a06829b42f08d26a95a51e408091bacb5b54119e380d042b88b1cff42c5eef76' 
  AND token = 'zpNHKzmt3xUAkABpuSb0VV0ew8+aOaarn5vst0R5w+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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