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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '023e5a9d6573c50e9771ee72958879192ef7358829ad6b6e4673ba001c098098' 
  AND token = 'cSqDtL8HguKT9/jqP5vh27544nRRO8A5ni4Zf4poYAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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