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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f3f0e0b5759ba812c9f05b270c6ba6e36aa9dcf8f5e3430374008bb180e3f054' 
  AND token = 's6Q9Zb5iF+MPxwQBQCbSUIjTBrCFLcMNxZ1S5V846ZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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