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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '754555f9a2da51c1165fd73ce287ad710b923cfa9aea2bb5fc73ff4f4a567fe7' 
  AND token = 'mVastrh+sK28P3BzqOYJliy3kX7zz5zJIsUKzoVcoy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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