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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '729ebb0e45e79022630ebd44a171d0fe84dffaa3905b47e01d2771ad274a72d9' 
  AND token = 'eYTRQNAr65zHuGabS7AaGD6R2VVVyTuYi4o+WlyDhns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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