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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'db12cf63502206064726257cc64642c19dccf09a5ea9b752d8a6d363a292c272' 
  AND token = '23UZzB0ObiZLDWF0SQuSIUxdtTzcVv40okvJDRKimQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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