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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1626426c14357ae130cd343fe31acfbb622c9ecabd8310a2d59e26869a5f7067' 
  AND token = 'bu4gaS2fB67sZS8ZDSBvxaw20ceHics1KnGV9yX/nPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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