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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '16fbc8f0b5b1b4c48445fe2e8592daa81c50825597cd12b060b6629656ab0c4b' 
  AND token = 'QI8gx6pLx0TvbKsHbift5rOV7bY/n14Fi4F+FpihuvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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