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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '80ba69143ad1c58225d6c72d4aad3781adf0e3349d373ddac5fc2ab857ef1eeb' 
  AND token = 'NP4zrS+aeGSfe8ckedMxvdyGX2M+k9zI3O4M8wnYO1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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