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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4c9720ea11375f016be4c0f60a0c8ff43b6581f4409825e90fd5254b841c2934' 
  AND token = 'wGLs5hT70xtIB7lc93LKLEK6PIyfRurEfGPS3pWJ+lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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