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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6eba96e59be14742b00b69d2896687e0819e799dfdb95203c90ad25c9157f9ae' 
  AND token = '/bzlJlnA/LiBE6h/uxDdnRxSpcl3a7QQ5JIdHpUvG24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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