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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0c841a8ff6b61eac449edc8d681531059cc7dc8f9ae5617881995bf7cfcff872' 
  AND token = 'oL3F/amWMv4re86gteRTLENUZ8hB7HWkssFLhQ1PuI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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