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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0540379db4e53d425d8013e84bc471c7512777f0fe4f60a82b81bc42f4edb13d' 
  AND token = 'RdZJlJTCSh3cKTViPseZDbH6nMW+BS2ldkF3pIdRK60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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