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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0b8bfff617331bb6b3c83fa0d3e378506650c177ff1fe0d305ec98ebe56d3e1c' 
  AND token = 'Tf9YZMRxV9U0Fz41JVo3oaDbBL810E5AGiPrBFu2T4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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