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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4b4b667f483ae7f7533789463f0dacce30543ffc3f3e6d69e1bc855ea0cbb322' 
  AND token = 'HACBpjuwLy2sBUBPUQ2Unx0q1SIzbv5bT7fyD4cK1Ug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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