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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6506cce113a49bae31ac76dece48855528b8c9f90827d30f03cc034e1063890c' 
  AND token = 'vEHu2oUpza9x7cEFGGZR4bUaPzg6VGFOImM1+MRViJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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