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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '186dfedb2a13f27defefe18d93d87b64f94d9aa183deef0a64a15aece81fe68b' 
  AND token = 'PdXj7Uf9+heD31BdKLfXnE/fw5soBXsbHbJslw3zDEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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