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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eacbe6c7e785c94ac55262676727d1014bc9dec6c70bfc5d310b819e53e63227' 
  AND token = 'qa6L4KRZ56F1fxWvf7JRXbyry8K4tPs3hA032StKMWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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