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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b9d299b97fbe0a089abd4cdeb3c3c1aae91e57183503f45826979ceb7d88d3b2' 
  AND token = 'FykoIthx7BmJac2UD+qz0Xaa5e+WHjwxHLAJHyW6Le0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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