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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0c2cc0d5af58c03c3f57aa11fdd206566e3d3e4c915963ea1a8894319a64647f' 
  AND token = 'qEx0MY3V1F26zhvE3IcvrZmoiPnLCy5ZBezqSNCSl3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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