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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6f47497dce74dacbbf5cfcc015aeacff5f8990c0cffe442d653782b5b18e4bd5' 
  AND token = 'Ny+iPyPfWPbcE7Jh3rF2ROvGH0vHv5lt299JGDtTlz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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