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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '90a281de412a4b2ca5c24dbd4c9520c583358198c3fc0fdaf526d68542bd678d' 
  AND token = 'i2i1gz1Yse2U9C6zcE2oV3fQ0Z+Zs5SBw3rg0vds+7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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