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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bebee610fe071aa7241b7fea1f5f2ecc41a00421d18fed26d5f2993ae607d090' 
  AND token = 'kqSwObWq6x5IfyA5605wpwszfVLSrE48EroXmqn1aVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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