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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eec05aafadd37efab17dc42f0642b59ed23888d87d01a21f090a5a2bc8522159' 
  AND token = 'pv14gK7e21WYXCNV05Re+XKlMX+d7aamPdAukcqyIeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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