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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '42429a51f2f43c01e1c17ea7445d3a3707599d44ea7852315496d5dacf116d82' 
  AND token = 'mklxb8eGoS0W1jDbGf4voHysuGDgaLcSS/MxI6qv2KU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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