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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2ce07b2846d7880af0decebb4c5b35af8196a0e62c0fde78c0724c82cd4cbbcb' 
  AND token = 'TpepOV918ugkajD9UyGyfpMNqmZcwgXId6ENIuP+XmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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