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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '30f2d0b7c3cb58a985db9befefeb1f499c1f2477e4f6d0eac2681f295e2f18d0' 
  AND token = 'twb1KaKE66GX4n+jcYy3v0afGeFEGw7SnIg1Q4wskAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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