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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '84078476985745ee54562c054f1a4bed2a7609c8be8cae2e79a79c3ef5a665f3' 
  AND token = 'gvawbF2TL21Xrq5KK4ddSh8U5UiwRhDdYCH6HyIYNPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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