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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9743f133af1d3a3bceacc9fa1bb1179283af15eccaf943993952be6f67b527b4' 
  AND token = 'hfe6NevDOeTUwqnvXbjNSIZulA5bUxsoPytTXA+iTH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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