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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6cb7992ad318dc492fedaf4e62858d32ad1c169c4df529dd44322a1c32e93c44' 
  AND token = 'eKDjc8oTC8vpLT8vinAASm0ViHxwaXmlSHngmi0ADAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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