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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '22dddb3f525cbcc183fd9b6967bfa92a4db79e7bc404d29f3f0c1a4731a27d64' 
  AND token = 'Zg6SFE3HTxBdFOIBp/oZsIeom95MWNZxO5619rhIdEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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