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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '28bdcd263b62dc90ed287daca83986a362d3aca1171828191897106a9bd956a1' 
  AND token = '4pQZJu3bBlKDssXCQI6Cn1jr8Gidm++HKZFO4t42Vsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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