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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '794203eac04545d547ceb1fc67696dc541549935189a44d0fa5d4aca7bb80cee' 
  AND token = 't1pGLkEsnLKXpfCFK4KH+5bPYuDi++t58bINz22FmHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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