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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dcc0f7f30f7752e46147f2f1e6256a8d63839b3f3cc009ede7a799a610b031e7' 
  AND token = 'ctuq+hGnPU0T5qQayy0DUc/ueh8P958lf4wjXx52KIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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