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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7ab948189f95080fdb679501a996c66e807799631fcf62819447e8ec8f364342' 
  AND token = 'Xmf8yJEL93LLe83bFn46JI+DdPBBNcLqLy/0vgXqGao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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