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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3979d77de55cf6753036fac8ac3a449e3fc869b0f83566bf203a7317b753c228' 
  AND token = 'eet+RlV0xfLNCX68yO/sj0c67WWzZZjVqFksAcAOkCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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