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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fd5f91b23084463ae90ac2592649a5ddc0671c4bfff10193254361ad186f7a34' 
  AND token = 'PQJBL/9AtNoxVssVSH2C9AP5chodu/ieSAbksyJiZ3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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