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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '58ce2c146d1b9638add43a6a8d18353493158714d645363e1e2cc26ccb1789c1' 
  AND token = 'ouuR7ciads8X3X6W4dt9/UnKP/0WLaTaZZCAOWi8ecw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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