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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '31c1bc856b916cd8a9fa3b5219b3f3b34158874587b45a031f500bd30c0fdf5d' 
  AND token = '887hNueY1pzFICt5Ih+bh2q9j2qhLr85FsOm086dtnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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