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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e07789d09d08ebb43172568d2c3764dbae65997e20f034c71e93bb6eca0ba1a6' 
  AND token = 'iX9iLydgh+n45Gc0HAmRPB6uHeRIjp04P2ZVvenAZ7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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