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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f2e1d661c436810be241e60fba88659fa7b12c31adc3d9aa2f3fb8b7b7892da3' 
  AND token = 'NDC6DnUShV8OFoMjZjciQErSw7mdRQl3hMuUxpYMYog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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