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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '893f44f13e251995a76e50db5b7e40020c1880265c344d5a2a6b6de95dd9231a' 
  AND token = '9NAovyD6UiYrZsgh9JioOs2P854+OPV9nZQ40RvyCmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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