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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c544fe365a4bf86f23198f4576af5222212aff1bb2320b8d49e808242f1faaf7' 
  AND token = 'gu508dxgL7Gp/l0HmLuEicnt5dKG2RCMi5Vba8vcsOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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