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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8d5c6c7c8fd61a2c9f240381471ad76a75660e130e5e0a2398b65f6753309a2b' 
  AND token = 'XopSua2FToEB4lnM6xl3SFiujyuIR4AMysaYuaoIqzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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