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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'abe0a87908abd224875e00132a9e3288071f3f7048761d67d01352fe54d54e21' 
  AND token = 'RJUg50hD/17qu/vWDnYxXbTfetyW6idfvrxpCipVnqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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